6. When a petition and the documents contemplated in section 5 are presented to the Board, it must assure itself of the representative nature of the association as regards the producers, and assure itself that the by-laws of such association:
(a) contain no provision unjustly preventing a producer from being either a member of a syndicate or of a specialized syndicate, a syndicate or specialized syndicate from being a member of a federation or of a specialized federation, or a federation or specialized federation from being a member of the association;
(b) provide for the conditions of affiliation of a federation or a specialized federation with the association;
(c) provide for the right of producers who are members of syndicates or of specialized syndicates affiliated to federations or to specialized federations which are members of the association to attend and vote at meetings of the association either directly or through delegates;
(d) grant to ten per cent of the producers who are members of syndicates or of specialized syndicates affiliated with federations or specialized federations belonging to the association the right to hold a special general meeting of the association.